User extensions

User extensions is a way to extend Zigbee2MQTT behavior, user extensions works in same way as internal extensions.

To get familiar with extensions framework please read source code of internal extensionsopen in new window.

User extensions are stored in data/extension folder and have to export a JavaScript Class or Function.


File: data/extension/my-first-extension.js

class MyExampleExtension {
    constructor(zigbee, mqtt, state, publishEntityState, eventBus, settings, logger) {
        this.zigbee = zigbee;
        this.mqtt = mqtt;
        this.state = state;
        this.publishEntityState = publishEntityState;
        this.eventBus = eventBus;
        this.settings = settings;
        this.logger = logger;'Loaded  MyExampleExtension');

     * This method is called by the controller once Zigbee2MQTT has been started.
    start() {
        this.mqtt.publish('example/extension', 'hello from MyExampleExtension');

        // All possible events can be seen here:

        // Subscribe to MQTT messages
        this.eventBus.onMQTTMessage(this, (data) => {
            console.log(`Received MQTT message on topic '${data.topic}' with message '${data.message}'`);

     * Is called once the extension has to stop
    stop() {

module.exports = MyExampleExtension;

User extensions list

Once Zigbee2MQTT starts it publishes zigbee2mqtt/bridge/extensions with payload [{"name": "my-first-extension.js": "code": <HERE COMES YOUR EXTENSION SOURCE CODE>}] containing all the loaded user extensions.

Save user extension

To save a user extension over the API publish to zigbee2mqtt/bridge/request/extension/save with payload {"name": "my-first-extension.js", "code": <HERE COMES YOUR EXTENSION SOURCE CODE>}.

Remove user extension

To remove a user extension over the API publish to zigbee2mqtt/bridge/request/extension/remove with payload {"name": "my-first-extension.js"}.